/*
 * Copyright (C) by Klaas Freitag <freitag@owncloud.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 */

#ifndef SYNCFILEITEM_H
#define SYNCFILEITEM_H

#include <QVector>
#include <QString>
#include <QDateTime>
#include <QMetaType>
#include <QSharedPointer>

#include <csync.h>

#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && !defined(Q_CC_CLANG) && (__GNUC__ * 100 + __GNUC_MINOR__ < 408)
 // openSuse 12.3 didn't like enum bitfields.
 #define BITFIELD(size)
#else
 #define BITFIELD(size) :size
#endif


namespace OCC {

/**
 * @brief The SyncFileItem class
 * @ingroup libsync
 */
class SyncFileItem {
public:
    enum Direction {
      None = 0,
      Up,
      Down };

    enum Type {
      UnknownType = 0,
      File      = CSYNC_FTW_TYPE_FILE,
      Directory = CSYNC_FTW_TYPE_DIR,
      SoftLink  = CSYNC_FTW_TYPE_SLINK
    };

    enum Status {
        NoStatus,

        FatalError, ///< Error that causes the sync to stop
        NormalError, ///< Error attached to a particular file
        SoftError, ///< More like an information

        Success, ///< The file was properly synced
        Conflict, ///< The file was properly synced, but a conflict was created
        FileIgnored, ///< The file is in the ignored list (or blacklisted with no retries left)
        Restoration ///< The file was restored because what should have been done was not allowed
    };

    SyncFileItem() : _type(UnknownType),  _direction(None), _isDirectory(false),
         _serverHasIgnoredFiles(false), _hasBlacklistEntry(false), _status(NoStatus),
        _isRestoration(false), _should_update_metadata(false),
        _httpErrorCode(0), _requestDuration(0), _affectedItems(1),
        _instruction(CSYNC_INSTRUCTION_NONE), _modtime(0), _size(0), _inode(0)
    {
    }

    friend bool operator==(const SyncFileItem& item1, const SyncFileItem& item2) {
        return item1._originalFile == item2._originalFile;
    }

    friend bool operator<(const SyncFileItem& item1, const SyncFileItem& item2) {
        // Sort by destination
        auto d1 = item1.destination();
        auto d2 = item2.destination();

        // But this we need to order it so the slash come first. It should be this order:
        //  "foo", "foo/bar", "foo-bar"
        // This is important since we assume that the contents of a folder directly follows
        // its contents

        auto data1 = d1.constData();
        auto data2 = d2.constData();

        // Find the length of the largest prefix
        int prefixL = 0;
        auto minSize = std::min(d1.size(), d2.size());
        while (prefixL < minSize && data1[prefixL] == data2[prefixL]) { prefixL++; }

        if (prefixL == d2.size())
            return false;
        if (prefixL == d1.size())
            return true;

        if (data1[prefixL] == '/')
            return true;
        if (data2[prefixL] == '/')
            return false;

        return data1[prefixL] < data2[prefixL];
    }

    QString destination() const {
        if (!_renameTarget.isEmpty()) {
            return _renameTarget;
        }
        return _file;
    }

    bool isEmpty() const {
        return _file.isEmpty();
    }

    bool hasErrorStatus() const {
        return _status == SyncFileItem::SoftError
                || _status == SyncFileItem::NormalError
                || _status == SyncFileItem::FatalError
                || !_errorString.isEmpty();
    }

    // Variables useful for everybody
    QString _file;
    QString _renameTarget;
    Type _type BITFIELD(3);
    Direction _direction BITFIELD(2);
    bool _isDirectory BITFIELD(1);
    bool _serverHasIgnoredFiles BITFIELD(1);

    /// Whether there's an entry in the blacklist table.
    /// Note: that entry may have retries left, so this can be true
    /// without the status being FileIgnored.
    bool                 _hasBlacklistEntry BITFIELD(1);

    // Variables useful to report to the user
    Status               _status BITFIELD(4);
    bool                 _isRestoration BITFIELD(1); // The original operation was forbidden, and this is a restoration
    bool                 _should_update_metadata BITFIELD(1);
    quint16              _httpErrorCode;
    QString              _errorString; // Contains a string only in case of error
    QByteArray           _responseTimeStamp;
    quint64              _requestDuration;
    quint32              _affectedItems; // the number of affected items by the operation on this item.
     // usually this value is 1, but for removes on dirs, it might be much higher.

    // Variables used by the propagator
    csync_instructions_e _instruction;
    QString              _originalFile; // as it is in the csync tree
    time_t               _modtime;
    QByteArray           _etag;
    quint64              _size;
    quint64              _inode;
    QByteArray           _fileId;
    QByteArray           _remotePerm;
    QByteArray           _checksumHeader;
    QString              _directDownloadUrl;
    QString              _directDownloadCookies;

    struct {
        quint64     _size;
        time_t      _modtime;
        QByteArray  _etag;
        QByteArray  _fileId;
        quint64     _other_size;
        time_t      _other_modtime;
        QByteArray  _other_etag;
        QByteArray  _other_fileId;
        enum csync_instructions_e _instruction BITFIELD(16);
        enum csync_instructions_e _other_instruction BITFIELD(16);
    } log;
};

typedef QSharedPointer<SyncFileItem> SyncFileItemPtr;
inline bool operator<(const SyncFileItemPtr& item1, const SyncFileItemPtr& item2) {
    return *item1 < *item2;
}

typedef QVector<SyncFileItemPtr> SyncFileItemVector;

}

Q_DECLARE_METATYPE(OCC::SyncFileItem)

#endif // SYNCFILEITEM_H